image editing

grayscale an image

converts an image into greyscale

function create_grey( ) [ line 2 ]

full source of grayscale an image [ line 1 - 20 ] | download grayscale an image

1	<?php
2	function create_grey($input,$output)
3	{
4	$bild = imagecreatefromjpeg($input);
5	$x = imagesx($bild);
6	$y = imagesy($bild);
7	for($i=0; $i<$y; $i++)
8	{
9	for($j=0; $j<$x; $j++)
10	{
11	$pos = imagecolorat($bild, $j, $i);
12	$f = imagecolorsforindex($bild, $pos);
13	$gst = $f["red"]0.15 + $f["green"]0.5 + $f["blue"]*0.35;
14	$col = imagecolorresolve($bild, $gst, $gst, $gst);
15	imagesetpixel($bild, $j, $i, $col);
16	}
17	}
18	imagejpeg($bild,$output,90);
19	}
20	?>

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